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  <title>Converts a palette based image to true color</title>
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    <li>Converts a palette based image to true color</li>
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  <div id="layout-content"><div id="function.imagepalettetotruecolor" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imagepalettetotruecolor</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.5.0, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">imagepalettetotruecolor</span> &mdash; <span class="dc-title">Converts a palette based image to true color</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imagepalettetotruecolor-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imagepalettetotruecolor</strong></span>(<span class="methodparam"><span class="type"><a href="class.gdimage.html" class="type GdImage">GdImage</a></span> <code class="parameter">$image</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Converts a palette based image, created by functions like 
   <span class="function"><a href="function.imagecreate.html" class="function">imagecreate()</a></span> to a true color image, like 
   <span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.imagepalettetotruecolor-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    <dt>

<code class="parameter">image</code></dt>
<dd>
<p class="para">由图象创建函数(例如<span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的 
<span class="classname"><a href="class.gdimage.html" class="classname">GdImage</a></span> 对象。</p></dd>

   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.imagepalettetotruecolor-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code>true</code></strong> if the convertion was complete, or if the source image already 
   is a true color image, otherwise <strong><code>false</code></strong> is returned.
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.imagepalettetotruecolor-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
 <td>8.0.0</td>
 <td>
  <code class="parameter">image</code> expects a <span class="classname"><a href="class.gdimage.html" class="classname">GdImage</a></span>
  instance now; previously, a <span class="type">resource</span> was expected.
 </td>
</tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.imagepalettetotruecolor-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2696">
    <p><strong>示例 #1 
     Converts any image object to true color
    </strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;Backwards&nbsp;compatiblity<br /></span><span style="color: #007700">if(!</span><span style="color: #0000BB">function_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'imagepalettetotruecolor'</span><span style="color: #007700">))<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;</span><span style="color: #0000BB">imagepalettetotruecolor</span><span style="color: #007700">(&amp;</span><span style="color: #0000BB">$src</span><span style="color: #007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(</span><span style="color: #0000BB">imageistruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">))<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return(</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$dst&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">));<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">imagecopy</span><span style="color: #007700">(</span><span style="color: #0000BB">$dst</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$src</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">));<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$src</span><span style="color: #007700">);<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$src&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$dst</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return(</span><span style="color: #0000BB">true</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;Helper&nbsp;closure<br /></span><span style="color: #0000BB">$typeof&nbsp;</span><span style="color: #007700">=&nbsp;function()&nbsp;use(</span><span style="color: #0000BB">$im</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">'typeof($im)&nbsp;=&nbsp;'&nbsp;</span><span style="color: #007700">.&nbsp;(</span><span style="color: #0000BB">imageistruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">)&nbsp;?&nbsp;</span><span style="color: #DD0000">'true&nbsp;color'&nbsp;</span><span style="color: #007700">:&nbsp;</span><span style="color: #DD0000">'palette'</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />};<br /><br /></span><span style="color: #FF8000">//&nbsp;Create&nbsp;a&nbsp;palette&nbsp;based&nbsp;image<br /></span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreate</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$typeof</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">//&nbsp;Convert&nbsp;it&nbsp;to&nbsp;true&nbsp;color<br /></span><span style="color: #0000BB">imagepalettetotruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$typeof</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">//&nbsp;Free&nbsp;the&nbsp;memory<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
typeof($im) = palette
typeof($im) = true color
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.imagepalettetotruecolor-seealso">
  <h3 class="title">参见</h3>
  <ul class="simplelist">
   <li class="member"><span class="function"><a href="function.imagecreatetruecolor.html" class="function" rel="rdfs-seeAlso">imagecreatetruecolor()</a> - 新建一个真彩色图像</span></li>
   <li class="member"><span class="function"><a href="function.imageistruecolor.html" class="function" rel="rdfs-seeAlso">imageistruecolor()</a> - 检查图像是否为真彩色图像</span></li>
  </ul>
 </div>

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